I had planed on building a bathroom, office, storage room, and a machine room for metal work . I allocated 1000 sq ft for that, the 1st whole 20X50 bay. I wanted to make it 2 levels and put all my wood working tools up stairs. I have a sander that weighs 3000lbs another one @ 1500lbs etc... so lots of weight up there. I planed on a 140lb per sq ft live load floor load ( could drive a fork truck on it if you could get it up there
I wanted to use a steel I beam for the supports and put steel posts in, but a quick calculation shot that down. The dam posts would have punched through the 4000 psi 6" slab unless I put huge plates on them or used way too many of them. So some more calc's and it looked like a 2"X6" stud wall double plated top and bottom with blocking and sheeted would support the load. So that was the plan, Then I looked into the floor joists the parts where they needed to have a clear span the loading was HUGE and I couldn't come up with some thing that would have worked out of wood for a price I could live with. I then started looking at steel floor truss's I found a co in Canada that made some really slick stuff. The only problem is they did not have any distribution near me :-( They would sell me a whole semi truck load of them, but not the 50 of them I would need..... I also wanted to insulate that space better than the whole building ( R13 walls and roof and double foil double bubble radiant insulation in the roof) So I had a space of about 8" from the purlans and girts so I went with some R-25 bats for that space.
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This is just your typical Iowa pole barn.

So I installed a 1000 gallon tank and 100' of a 36" wide chambered leach field system. Much faster than the normal drain pipe/drain rock system to install.